Envelop.



- Z/zfn. 1. 33691 G. J. HARTKE.

ENVELOP. APPLICATION FILED MAY 31, 1911.

7 997,999; Pateqted July 18,1911.

. STA ES IATENT OFFICE.

GEORGE J. HARTKE. or CHICAGO, ILLINOIS.

'ENVELOP.

specification of Letters Patent. Patented July 18,1911.

j Application filed May 31, 1911. Serial naesaaoo.

To d ll whom it may concern: 1 Be it. known that I, GEORGE J. HARTKE, acitizen of the United States, residing at Chicago, in the county of Cookand State.

Letters Patent'No. 532,206 granted Jann 5 arydth; 1895, to A. D. Klaberwhich is known to the trade by the name Neostyle.

The Ueostyle envelop as shown in'the patentand as heretofore made isopen to several object-ions. One of these is that duris heldiiir place'only'by, reason of the fact tha'h'it projectsv a short distancebeneath, or,

to state it .difierently,'i'sf partly overlapped by the adjacent side ofthe bottom flapbut otherwise it; is not: engaged by'any part oft-beemnelop-that' would have a tendency to hold it-in Yplace. Beingloose and disenbodying the inventionis made. Fig; 2 is'a gagdiexcept asaforesaid, when the envelop is beingfilled, it is sometimes'forced'upward and outward and .freed from engagement withfthejbottornflap This is apt'to happen frequenilynnl'ess'the operatoris'experienceda Another; objection .to the N eostyleienvelop asheretofore made-is thateven afier i'sfilled. and isealed,.l the looseflap is sometimes freed 'from its engagement out.

with theltop andibottom flaps and forced This mayhappen whenxp'ressureis suddenly exerted upon thesealed envelop, especially when" severai ofthem are piled up, one: upon another, immediately after being sealed.When firstsealeil a: considerable volume of air is impri'sdned in Qtheenvelop and the sudden expulsion ofth'i's air ineident to compressingthe .pile of envelops, blows the loose flap out. Again the loose flap issometimes forced out asthe'mail being distributed or otherwise handled.

This willh'appen if the envelop with: its in closure is so handled thatthe inclosure is thrown against the loose flap, especially if theiiiclosure is heavy. It has been proposed to overcome these objectsbyproviding the looseSi'de flap with a tongue 'inlt he form of a hook,and soun itingthe fixed side flap and the-bottom fiap as to form apocket which is occupiediby the hook and the. stop; for" engaging thehook and preventing (it "from' "being ccidentally withdrawn -'fiothepockettf n f'the-manufacture of p 2 ed out. ing the; filling;operation the loose side flap 5 3 proved Neo'style envelop, the precise1 provide an envelop which has-all the: ad-

vantages of the Neostyle modified as'above befree from'the objections{last above point-- To, this end the 1 inventionctmsists in. the

features of novelty that are hereinafter'described, v In theaccompanying drawing-whichr-is made a part of this'specifioation, Figure1 is i a, diagrammatic representation of a. partly folded blank fromwhich an envelop emsimilar View 1026-11119 envelop completed and I inreadinesstobe loaded and sealed.

Arepr'esents the front of the envelop; B i the'topor sealing flap,"-Cthebotto n' flap, D

; theloos'e side flap, and E theremainingside fiap,-'the flaps C and Ebeing lfixedly secured together as hereinaften described.

, Both figures of the drawingzsh w the side flaps folded to thepositions which they oceupy. in the completed envelop, Fig. 1'. showsthe top and bottom "flaps'astheyappear in the blank, 1 the positions;which they "occupy in the completed- 1envelomafter-the blank is i foldedon the dotted-linesjajand a: being in- 5 dicated by the dotted:'liiiesb-fand 0, respecs tively-f i the extent of a portion which.overlaps it.

in anyway.

of the loose side fiap but they are-not united"*A.portion'ofthebottomflapC also overlaps and lies upon 1 theioutsi'deofa por ti'on of the side flap andv l'ihiitedareas'i V offthe ,surfa'cesof their overlapping portions are fiire'dly united 5 or.- securedtogether f described and'which, at-th'e same time shall-- the front, andalso upon theside flap Rte Thebottorn flapC-is thenfoldeddoWn upon]: thefront-A and also-upon both of the side flaps. A portion of thebottomflapwoverlaps and lies upon the-'outside'of a: portion 'siiit'ableadhesive s'ubstanoeas shown-by, "shade linesF,"-thus-leavingotherlii'nited surfaces of the overlapping portions of the several flapswhen the envelop is complete and sealed or ready to be sealed, which maybe done by the line of gum I), on flap B.

It will be observed that the gum F unites only limited portions of theoverlapping portions of the bottom flap C and the side fla-p E. Itextends continuously and uninterruptedly completely past and around theend of the .tongue d, thence over it and .thence downward, terminatingin a portion j, which forms a stop adapted to engage the upwardlyprojecting hook d formed on the tongue (Z. This stop extends downwardbev low the top of the hook at and prevents its I of withdrawing theloose flap, the natural tendency of the pressure of the thumbtheredirect movement toward the side of the envelop. which carries theloose flap. The ununited portion of the overlapping portions of theflaps C and E form the pocket f, which is of ample size to accommodatethe tongue and hook and in addition provides a clearance below thetongue which will perunit it to mnovedownward and enable the hook toclear the stop when the loose flap is purposely withdrawn. This latteris an portant desideratum,-because in the action on, is to move itdownward and this downward movement enables the tongue to be withdrawnfrom the pocket without bringingthe hook in contact with the stop f,whereby the liability of tearing the hook is avoided. On the other hand,when the envelop is being loaded, and its front and back necessarilyspread apart, the tendency will be for the loose flap .to move upwardand'escape from beneath the overlapping edge of the bottom flap, butthis upward movement relatively to the bottom flap is absolutelyprevented by the engagement of the tongue with the stop. In the formoriginally contemplated, the pocket was the result of a completeinterruption in the line of gum and the hooked tongue projected throughthis interruption. It was found however that, in applying the gum, therewas a tendency to spread outward from the edges of the glimmer and whenapplied would have an irregular or ragged outline, whereas in order toavoid its coming in contact with any part of the loose flap and at thesame time bring it to the necessary close proximity to the hook, it mustbe applied with considerable nicety. This is one of the reasons formaking the line of gum continuous in the vicinity of the hooked tonguebut. in addition to this advantage in the manufacture, the continuity ofa line of gum makes the completed envelop stronger.

\Vhat I claim as new and desire to secure by Letters Patent is:

As a new article of manufacture, an envelop having a front, and bottomflap and a fixed side flap, said bottom and side flaps havingoverlappingportions, a loose side flap opposite the fixed side flap,having a tongue provided with a hook presented up? ward and lyingbetween said fixed side flap and the bottom flap, and a line of gumuniting limited surface areas of said overlapping portions of the bottomflap and fixed side flap and leaving limited surface areas of saidoverlapping portions ununited, thereby forming a pocket which isoccupied by said hooked tongue and leaves clearance below it, the lineof gum extending continuously around the end and over the top of thehooked tongue and thence downward forming a stop for engaging the hookof the tongue and preventing its upward or outward movement.

GEORGE J. HARTKE.

l/Vitnesses:

A. ARENSON, L. M. HOPKINS.

